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CVE-2021-23567

21
FAUCET Score

CVE-2021-23567 describes a Denial of Service (DoS) vulnerability in the colors.js package versions after 1.4.0, stemming from an intentional infinite loop introduced by a maintainer. This vulnerability carries a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, leading to a complete loss of availability for affected systems. While there are no known public exploits or Metasploit modules, the incident garnered significant community discussion and media coverage due to its unusual nature as a purposeful sabotage.

Impacted Technologies

VendorProductVersion(s)CPE
1.4.1CPE matchmatch criteria
cpe:2.3:a:colors.js_project:colors.js:1.4.1:*:*:*:*:node.js:*:*
1.4.44-liberty-2CPE matchmatch criteria
cpe:2.3:a:colors.js_project:colors.js:1.4.44-liberty-2:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.73%
Probability of exploitation in next 30 days
EPSS Percentile
75.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0173 is in the 58th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-gh88-3pxp-6fm8high

Infinite Loop in colors.js

Jan 21, 2022

References

github.com / Marak/colors.js/commit/074a0f8ed0c31c35d13d28632bd8a049ff136fb6%23diff-92bbac9a308cd5fcf9db165841f2d90ce981baddcb2b1e26cfff170929af3bd1R18
PatchThird Party Advisory
github.com / Marak/colors.js/issues/285
ExploitIssue TrackingThird Party Advisory
github.com / Marak/colors.js/issues/285%23issuecomment-1008212640
ExploitIssue TrackingThird Party Advisory
snyk.io / blog/open-source-maintainer-pulls-the-plug-on-npm-packages-colors-and-faker-now-what
ExploitMitigationThird Party Advisory
snyk.io / vuln/SNYK-JS-COLORS-2331906
ExploitThird Party Advisory